package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import DB.GroupTableDB;

import com.google.gson.JsonObject;

public class DeleteGroup extends HttpServlet {

	ArrayList<JsonObject> Messages;

	/**
	 * Constructor of the object.
	 */
	public DeleteGroup() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		HttpSession session = request.getSession(true);
		String deleteGroupsStr = (String) request.getAttribute("groups");
		String userID = (String) request.getAttribute("email");
		String ownerID = (String) session.getAttribute("email");
		JsonObject object = new JsonObject();
		if (deleteGroupsStr == null || deleteGroupsStr.equals("")) {
			object.addProperty("message",
					"You have to select at least one group!");
			response.setContentType("application/json");
			PrintWriter out = response.getWriter();
			out.print(object);
			out.flush();
			out.close();
		} else if (userID == null || userID.equals("")) {
			object.addProperty("message", "You userID cannot be empty!");
			response.setContentType("application/json");
			PrintWriter out = response.getWriter();
			out.print(object);
			out.flush();
			out.close();
		} else {
			GroupTableDB groupTableDB = new GroupTableDB();
			String[] deleteGroups = deleteGroupsStr.split("#");
			JsonObject group = groupTableDB.selectGroupByID(deleteGroups[0]);
			if (group.get(GroupTableDB.OWNERCOL).getAsString().equals(ownerID)) {
				for (String str : deleteGroups) {
					groupTableDB.deleteGroup(str);
					object.addProperty("message", "Delete Group Successfully!");
				}
				Messages = groupTableDB.seletGroupsByUser(userID);
				object.addProperty("message", "Delete successfully! Please refresh the page!");
				response.setContentType("application/json");
				PrintWriter out = response.getWriter();
				out.print(object);
				out.flush();
				out.close();
			}else{
				object.addProperty("message", "Only the owner can delete this group!");
				response.setContentType("application/json");
				PrintWriter out = response.getWriter();
				out.print(object);
				out.flush();
				out.close();
			}
		}

	}

	/**
	 * Initialization of the servlet. <br>
	 * 
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
